ANDY Murray is facing another challenge off the court this week - writing a best man's speech for his friend's wedding.

The former Wimbledon champion will be alongside best friend Ross Hutchins next week as he ties the knot with fiancee Lindsay Wood.

Murray, 27, is currently competing in the World Tour Finals at London's O2 Arena but has been using his downtime to put the finishing touches to his speech.

He admitted he is nervous about performing the best man duties at the marriage of his friend, who credited the tennis ace with helping him through his battle with cancer last year.

Hutchins, a Davis Cup doubles player, had six months of chemo­therapy after he was diagnosed with Hodgkin's Lymphoma and has since been given the all clear. Murray held a charity tennis match at the Queen's Club in London and donated his winnings from the pre-Wimbledon tournament to the Royal Marsden Hospital who treated Hutchins.

His efforts saw him given the Arthur Ashe Humanitarian Award for charity work following his win over Milos Raonic at the O2 on Tuesday.

He said: "It's been a tough couple of years with Ross Hutchins, who is a very good friend. Ross managed to get through cancer and was incredible through all the treatments.

"It's great to give back and raise money for charity. I'll try and do as best as I can for the rest of my career."